The OEInteractParams class provides a general mechanism for retrieving
multiple parameters from methods defined in the OEFFParams class.
The number and types of parameters required for calculating molecular interactions varies among
force fields. To keep the interface consistent among implementations of
OEFFParams for various force fields, parameters are stored in the
OEInteractParams class. Once parameters have been assigned in an
OEInteractParams instance they may be retrieved using
OEInteractParams.Get method.

Returns the parameter value associated with an integer taken from
OEFFParam namespace. The integer argument specifies the type of
parameter requested from the OEInteractParams instance. The requested
parameter type must match OEFFParams retrieval method to which the
OEInteractParams instance was passed.